A monument celebrating the idea of reaching inaccessible places.

A blooming house of worship for the masses.

5,000 skulls in memorial to those killed by the Khmer Rouge.

Natural arch offers panoramic views of Yangshuo's karst hills.

Air Force Academy Chapel made of 100 identical tetrahedrons works to inspire those of all religions.

The maritime museum that boasts the largest nautical library in the western hemisphere.

A multi-storied adobe complex has been inhabited for more than a thousand years.

Climb to the top of the world's largest seated bronze Buddha.

This museum glorifies the humble potato.

The most visited, and possibly most controversial, museum in Germany.

Formerly known as National D-Day Museum, this collection commemorates the battles of Normandy and WWII.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

Famously misunderstood wonder of the ancient world

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

An underground city of salt.

The world's tallest church tower reveals a spectacular view to anyone up to the task of climbing the daunting staircase.

The original home of the Lego has a huge amusement park dedicated to the iconic plastic toy.

The largest ice cave in the world is thought to be the entrance to hell according to Austrian legend.

Come for the flowers, stay for the bats!

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

The 953 windows undoubtedly make this the world's most beautiful screened porch.

A world-class observatory in the California desert.

Explore the complex ecology of this multifaceted nature preserve by riverboat.

A lush desert oasis in the shape of a narrow crescent.